DE102004010510A1 - Navigation system with a traffic information receiver and method for transmitting traffic information - Google Patents

Abstract

Around a navigation system with a memory for reading in Data from the currently traveled area from a data memory with a receiver to create traffic information, the traffic information storable in a memory and for consideration in the navigation guidance in the main memory are readable, in which the working memory one possible small size is proposed that the memory for traffic reports a filter device for the determination of those traffic announcements for the currently traveled area on the basis of a sorting criterion (13) added to the traffic announcements assigned. Furthermore, a method for transmitting traffic reports in blocks of data (10).

Description

technical area

The The invention relates to a navigation system with a working memory for reading data of the currently traveled area from a Data storage and with a receiver for the reception of traffic announcements whereby the traffic announcements in a memory storable and for consideration in the navigation guidance in the memory are readable and a method for transmitting traffic reports in blocks of data, the from records are composed, the data records in turn contain data fields.

State of technology

navigation systems can a route from a starting point, for example, the current one Position of the motor vehicle equipped with the navigation system is calculated to a destination entered by the user and by issuing of optical and / or acoustic direction instructions the user on the determined route to the destination. There can be more Inputs or parameters such as those excluded from the route selection road types or vehicle-specific sizes the determination of a route. The data in terms of the street and transport links are common in a removable data store like a CD-Rom or a DVD stored, with the navigation system to this data, for example via a reader can access. The determined travel route is stored in a route memory and the actual Position of the motor vehicle with a position determination unit such as a GPS receiver and with the predicted Route in a navigation guidance compared and corresponding directional indications issued to the user.

For this will be the data of the map section of the currently traveled area in terms of of the route and road network read from the data store and stored in a working memory of the navigation system to the To minimize the amount of data to be processed. Will the area, whose data is contained in the RAM is left Memory deleted and read in the data of the adjoining area.

It Navigation systems are known that are able to which are broadcast by broadcasters, in their navigation guidance to consider. Therefor the traffic reports are transmitted in coded form, whereby the navigation systems for it are designed to decrypt these messages and in the navigation guidance to consider. Thus, it is possible a traffic jam occurring in the short term in the traffic reports is reported to take into account to work out an alternative route and to show the user so the traffic jam can be bypassed.

The DE 35 36 820 A1 describes a traffic decoder for received traffic information, which are transmitted for example according to the RDS system (Radio Data System). In this case, the received and preferably digital signals are address signals in order to retrieve from a traffic posting memory in the traffic information decoder the standard information stored in the respective addresses in written form or in speech.

The EP 0 263 332 A1 discloses a receiver for receiving broadcasts with a memory for converting the digital signals into outputable tags. The memory is divided into road-oriented segments, which are in turn divided into distance segments. By transmitting the digital signals, the affected route segments, on which, for example, a traffic jam has occurred, are read from a memory and displayed to the user.

The EP 0 756 260 A1 describes a radio receiver with a control circuit in which multi-recurring traffic information is encoded by a replacement code. Only substitute words are transmitted or received by the radio receiver, which reads out the corresponding traffic information and location information from a memory on the basis of the substitute words and indicates to the user. The replacement words are addresses or pointers and refer to a memory location in the radio receiver where the actual term stands.

A disadvantage here is to be considered that in the radio receiver or the navigation system that processes the traffic reports, always a large memory is necessary to store all encoded traffic reports or location information, which are accessed only by transmission of appropriate code or substitute words. Furthermore, it is disadvantageous that all traffic reports are stored in a separate memory and are read into the main memory for the data of the currently traveled area for consideration in the navigation guidance. However, this requires a significantly increased memory, if all received traffic reports are to be read in these and, for example, in a transnational Road map, which is read from the data memory in the main memory, due to the large amount of stored data information is a considerable amount of data.

outgoing From this prior art, the invention is based on the object to create a navigation system with a memory at the memory has a minimum capacity. Continue to a method of transmission of traffic announcements, which makes it possible to the necessary memory in navigation systems for processing the Traffic reports as small as possible to keep.

These Tasks are each characterized by the features specified in claims 1 and 3 solved.

Of the The core idea of the invention is that the memory for traffic reports, in which all received traffic messages are stored in coded form, an additional Filter device is assigned to the received traffic information then check if they are belonging to the currently occupied by the motor vehicle area or for this Area are relevant. Often be used in the broadcast traffic news For example, congestion or disabilities in several states reported, where the congestion in extreme cases several hundred kilometers apart can. It is obvious that not all of these traffic announcements are for the moment busy area are relevant but only those traffic jams or Disabilities on the route determined by the navigation system lie. Furthermore, only those traffic reports are relevant, which have a current relation to the route. That means, that traffic announcements in distant areas, for example be driven in a few hours, not relevant now are, since these congestion to reach this area already disbanded can have. With the filter device are received and in memory stored traffic reports checked for their relevance and only those transferred into the main memory for consideration in the navigation guidance read in, that too are relevant. Here, the review of the Traffic reports in any way according to temporal and / or spatial Criteria are made. For example, the traffic reports from the filter device, which implements hardware and / or software in the navigation system is, on their spatial Assignment to be checked. For this purpose, as described below, each traffic message as Reference to their spatial Assignment or their spatial Relevance added a sort criterion. From the filter device the traffic reports are checked for the sort criterion and only those traffic reports are transferred to the main memory or released that for the busy area are of concern.

Of the Advantage of this navigation system is that the size of the required Memory in the navigation system can be reduced since not all incurred traffic reports must be read in these. This is associated with a significant cost savings.

For this will be transmit the traffic reports in blocks of data, the from records composed of data fields. To the spatial and / or temporal sorting of traffic reports are the Traffic information or the data blocks spatial data Assigned sorting. For example, traffic information a hint for the element of a defined mesh or a grid square of a digital map, the basis for the traffic information is to be assigned. It is understood that the navigation system to work out a route to the same digital map accesses. As well Is it possible, that information relating to their temporal relevance is assigned to the traffic reports is. This means that, for example, a blockage of a section of track only later and in the added ones Data or the sort criterion of this period is included, to which this information is taken into account in navigation guidance must become. These added Data is from a filter device described above used to transfer only the relevant traffic reports to the main memory.

hereby is defined a record that allows it from all traffic reports only the actual ones Filter out relevant, with the existing in the memory data blocks Any differently configured data blocks can be created.

advantageous Embodiments of the invention are each characterized in the subclaims.

According to the embodiment of claim 2, the traffic message memory is a TMC memory. The TMC system (Traffic Message Channel) known to the person skilled in the art is a free service of the radio stations with which coded traffic information for taking account of alternative routes is accordingly issued equipped navigation systems are transmitted. The traffic messages coded according to the TMC standard are stored in a correspondingly configured memory in the navigation system and, in the prior art, all are read into the main memory for navigation guidance. As a result of the additional transmission of data relating to the spatial allocation, as described above, the filter device can filter out those traffic reports which are actually relevant to the currently traveled area.

In can easily the data for spatial and / or temporal assignment in data fields of the transmitted Added traffic information are characterized as in claim 4. Preferably the first Field of a data block is assigned the TMC code. In further Fields are the for the traffic information necessary information or their Replacement words those in another memory in the navigation system the actual Traffic messages are assigned included. This information are z. As the information described in the TMC table known to those skilled in the art regarding "Location Type, Sub-Type, Road Number, Road Name, Negative Offset, Positive Offset, First Name, Second Name, Linear Reference and the like " in the records Fields inserted, the later ones Correspond to sorting criteria in the filter device. such Among other things, criteria are characteristics of the element of a defined Mesh or a grid square of the digital map and / or a time criterion for the traffic message.

alternative can the data blocks in total with data regarding be provided a sorting criterion to the TMC table in several Blocks too subdivide as specified in claim 5. This corresponds to a data block z. B. a mesh or a grid square of the digital map. Consequently may be from the total amount of traffic messages stored in the TMC memory the one to be extracted, the current to the map section is stored in the working memory, is associated.

Summary the drawings

A embodiment The invention is explained below with reference to the drawings. It demonstrate:

1 : a schematic representation of a data block and

2 : several records.

best way for execution the invention

From the schematic representation in 1 is a data block 10 It can be seen from several data sets 11 , which are each indicated here as a row, is composed. Each record includes 11 again several data fields 12 , which are arranged side by side in a row. Preferably, the first field 12 a record 11 provided with the TMC code known to those skilled in the art. In the other fields 12 are the information contained in the traffic report or their replacement values as in the EP 0 756 260 A1 disclosed. These data may include "Location Type, Sub-Type, Road Number, Road Name, Negative Offset, Positive Offset, First Name, Second Name, Linear Reference" according to the TMC Table.

In addition, as in 2 represented each record 11 Data for a sort criterion 13 assigned to the by each record 11 traffic message attributed to a spatial area. This is done especially in the second field 12 a record 11 ,

The implementation of the received TMC location number in the information location type, sub-type, road number, road name, etc. is done such that by comparing the received TMC location number with the corresponding data fields 12 the records 11 the TMC data blocks 10 in the memory of the navigation system a matching data field is searched. The associated record 11 therefore provides the information sought for the translation. So that the comparison does not take up unnecessarily much computing time, it can be helpful to check the length of the data records 11 by filler 14 to a constant length. In the same way, the size of the data blocks 10 be aligned. The fields with TMC locations in a data block are preferred 12 sorted according to defined sorting criteria to allow a filter device in the navigation system to filter out the traffic messages belonging to the currently traveled area from all received traffic reports and to forward a correspondingly small main memory of the navigation system for consideration in navigation destination guidance.

Claims (5)

Navigation system with a working memory for reading in data from the currently used area from a data memory and with a receiver for receiving traffic messages wherein the traffic reports can be stored in a memory and read into the working memory for consideration in the navigation guidance, characterized in that the Spei For traffic reports, a filter device for determining the traffic reports for the currently traveled area on the basis of a sorting criterion added to the traffic announcements ( 13 ) assigned. Navigation system according to claim 1, characterized that memory for Traffic messages is a TMC memory. Method for transmitting traffic messages in data blocks ( 10 ), which consists of data records ( 11 ), the data sets ( 11 ) again data fields ( 12 ), characterized in that the traffic reports a sort criterion ( 13 ) is added to the spatial assignment of the traffic message to an area. Method according to Claim 3, characterized in that the data in the data records ( 11 ) as data fields ( 12 ). A method according to claim 3, characterized in that the data in each case the data blocks ( 10 ) be assigned.